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rUOPKAL WILD LIFE IN BRITISH GUIANA 



I'IkiIi, hi/ l>. (I. II. 

 FIG. 102. ANl EMBRYO SHOWING PIGMENTATION OB^ THE FEMORAL TRACT 



closes at the neck, into a triple row, which becomes weaker 

 as it approaches the head. In the adult this portion becomes 

 more pronounced and is cleft below the base of the head with 

 a branch running above each eye. The cleft in tlie main 

 tract is shorter and is joined over half the sacral portion, 

 between the two main branches, by a middle row of feathers. 

 The pectoral tract consists of a double row naming 

 paiallel to the upper ventral and connected with it by a few 

 undeveloped sheaths. In tlie adult these feathers are fully 

 developed and completely fill the space between the outer 

 pectorals and the ventrals, thus forming a complete tract. 

 To this, outside and parallel to the ventral, runs a single 

 row of feathers, which, in the embryo, is nearly absent and, 

 only about twenty-four hours l)efore hatching, commences 

 to be noticeable. (Fig. 108.) 



